Ticket #47748 - Simultaneous adding a user and binding as the user could fail in the password policy check
Bug description: In do_bind, bind_target_entry is retrieved from the
DB or the entry cache. There was a small window that the entry failed
to retrieve from there but the bind procedure in the backend (be_bind)
succeeds. In the case, NULL bind_target_entry is passed to the Pass-
word Policy check and it fails.
Fix description: If be_bind returns SUCCESS and bind_target_entry is
NULL, retrieve bind_target_entry agian, which is guaranteed since the
entry was retrieved in the backend and placed in the entry cache.
https://fedorahosted.org/389/ticket/47748
Reviewed by rmeggins@redhat.com (Thank you, Rich!!)